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What is “parity” or “parity data”?

April 26, 2017parity

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What is “parity” or “parity data”?

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Posted

In a RAID 5 configuration, additional data is written to the disk that should allow the volume to be rebuilt in the event that a single drive fails. In the event that a single drive does fail, the volume continues to operate in a “degraded” state (no fault tolerance). Once the failed drive is replaced with a new hard drive (of the same or higher capacity), the “parity data” is used to rebuild the contents of the failed drive on the new one.